Tellabs is a global supplier to the dynamic telecommunications industry that designs, manufactures, markets and services voice, data and video transport and network access systems. These products and services are used worldwide by public telephone companies, long-distance carriers, alternate service providers, cellular and other wireless service providers, cable operators, government agencies, utilities and business end-users.
Voice Over IP is a new communication means that let you telephone with Internet at almost null cost. How this is possible, what systems are used, what is the standard, all that is covered by this Howto.
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